GD-ROM Dumping Guide

From Redump Wiki

GD-ROM dumping guide. See here for information about dumping GD-R (recordable discs).

GD discs were used by the Sega Dreamcast, Sega NAOMI, Sega NAOMI 2, Sega Chihiro, and Triforce arcade systems.

The discs contain two distinct areas, a Low Density Area ("LD Area") and a High Density Area ("HD Area"), physically separated by a ring. You'll need to dump both areas of the disc, each requiring different drive models and methods.

LD Area

Tools

• An optical drive listed in Optical Disc Drive Compatibility: CD
• A Windows, Linux, or macOS computer
• MPF application (includes Redumper)

Dumping

The LD Area is formatted like a standard CD-ROM, so should be dumped using the standard Disc Dumping Guide (MPF) with a CD-ROM compatible drive. The CD-ROM profile should be selected in MPF.

HD Area

Tools

• An optical drive listed in Optical Disc Drive Compatibility: GD-ROM
• Windows or Linux computer
• dreamdump app

Dumping

• Open command line interface app
• cd (change directory) to the location of the dreamdump app.
• Dump with the following command: dreamdump disc --drive="[drive letter]" --image-name=""

Submitting your dump info

Here are example submissions: [1] [2]

We'll presume you've used Disc Image Creator for your dump in both LD and HD Areas.

Open your "!submissionInfo.txt" files from both your LD and HD Area dumps. Copy in the additional track information from your HD Area !submissionInfo.txt file into your LD Area !submissionInfo.txt file in three sections:

• "DAT"
• "Cuesheet". When combining Cuesheet data for LD and HD Areas, paste "REM SINGLE-DENSITY AREA" at the top of the cuesheet, and "REM HIGH-DENSITY AREA" in a new line after the LD Area cuesheet into, then finally the HD Area cuesheet text.
• "Write Offset". For determining write offset for HD Area of a DCDumper + ice.exe dump, open the .txt file output by Ice:
  • Combined offset = Disc offset + Drive offset.
  • Kreon drives used for DC dumping have a +6 offset.
  • Calculation for Disc Offset: [Example Combined Offset of +30] - [(Any Kreon Model) Drive Offset of +6] = [Disc Offset of +24].
  • Offsets for GD-ROMs are formatted in entries as follows: [LD Area disc offset]|[HD Area disc offset].

Fill in Ring Code data and any relevant Comments. Post on the Redump "New Dumps" subforum.